Malicious PDF — malware analysis report

Static analysis result for SHA-256 f887ebb58522915e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 10:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a83db28fd8493be6635fe22815275ae SHA-1: d0c054f9243567e7332d298b5f9371eb7f407f38 SHA-256: f887ebb58522915e9744faf7adba9097ce48a86f8d6f1ff4fb703c397796a809
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm designed to redirect users to various external websites, masquerading as search results for 'Spider man ps4 error'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external links, many hosted on disposable domains, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/123?utm_term=spider+man+ps4++error
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/vozodo-wodimibowiwop-wipule-pimunedenifi.pdf
    • https://zonidazoledod.weebly.com/uploads/1/3/1/0/131070441/fabekegomiramomu.pdf
    • http://zozuwax.66ghz.com/malokefemapu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_5ed72b252dcc4c0d87925f3ef820cd5a.pdf?index=true
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_3c76f559b5064033bc7b743b8a6add82.pdf?index=true
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_aeaa79d6009b4c779beedb33049aee05.pdf?index=true
    • https://s3.amazonaws.com/temujonuwu/aa_sex_inventory_questions.pdf
    • http://biwewija.rf.gd/tafenoduxafodorabixugo.pdf
    • http://kagowuv.epizy.com/how_do_you_reset_the_water_filter_light_on_a_frigidaire_refrigerator.pdf
    • http://numekup.epizy.com/hewlett_packard_laserjet_4050_driver_download.pdf
    • https://uploads.strikinglycdn.com/files/19908199-6412-49f4-a877-74b585dd5196/tokikonavogemul.pdf
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_9d1a1bed94a140dd8999ce75b98162f1.pdf?index=true
    • https://s3.amazonaws.com/tonemakopinibem/fidaba.pdf
    • https://6ada6c45-9e8d-4063-9633-40b9e375d9b0.filesusr.com/ugd/9a7afa_4c251d5681624f878a535e976dc09db1.pdf?index=true
    • https://s3.amazonaws.com/xilasisefi/65640928575.pdf
    • http://lipewolitaden.epizy.com/god_bless_america_violin_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/0e4854ae-ee58-46ed-a115-d55d2c879764/how_to_draw_young_adults_live_with_their_parents.pdf
    • https://uploads.strikinglycdn.com/files/259f8379-52be-448e-8243-fce838689b1e/descargar_libro_los_5_lenguajes_del_amor_para_nios.pdf
    • https://uploads.strikinglycdn.com/files/a721f2f4-cead-4b82-a2a0-c41dbaa823f5/73093678246.pdf
    • https://uploads.strikinglycdn.com/files/0d131174-69fc-4b64-b94a-356eb54c69c0/75810738078.pdf
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_7fcd1fb937ae42c98f3aed0e35f2f5dd.pdf?index=true
    • https://s3.amazonaws.com/farowug/4448321510.pdf
    • https://s3.amazonaws.com/pojikovewijeja/how_to_learn_subnetting_the_easy_way.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56c.bin
36a24f9fe0f246970d2de401058fb372dad1a28c41b2aa1922e67cf0fcfd6dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 5264 bytes
font_01_sfnt_off00010739.bin
7ee5357e985942b7125f21965b1ec388d240de0a72fa79b1cb5efb094c15aa5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 10704 bytes

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